corporal daniel greer. >> i think about him every day.re's though amount of emotion that could ever take that away. i know i didn't do anything wrong. but maybe i didn't do enough stuff right. life gets easier. the prosthetics get easier. understanding that corporal greer is gone for good doesn't. it never will. never. >> reporter: his rigorous physical therapy routine is paying off. >> i'm walking. i can put on slacks. i'm being aggressive and taking control of my life again. >> reporter: he's just finished his first semester at the university of maryland. >> i have family to take care of. i'm not going to make a living with my hands again. i thing i definitely felt a sense of urgency when it comes to being successful. >> reporter: he's an intern with the defense threat reduction agency and a volunteer with the armed forces foundation. >> anything i can do for the charities that impacted my life, i try to give back. >> reporter: he's been presented with numerous awards and countless medals. at this year's dinner for combat and commander,